1957
DOI: 10.1021/cr50017a600
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Sterochemistry and Heterogeneous Catalysis

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Cited by 106 publications
(39 citation statements)
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“…On the other hand, trans-alkene formation is generally related to the addition of molecular hydrogen from above the axis of unsaturation [36,50]. For the transformations of internal alkynes, trans-alkenes are always formed, either as initial products or via cis → trans isomerization [51], this being accompanied by alkane production through overhydrogenation [33]. Preliminary investigations suggested that the Pd-M samples were less active for the transformation of 4-octyne than for that of phenylacetylene.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, trans-alkene formation is generally related to the addition of molecular hydrogen from above the axis of unsaturation [36,50]. For the transformations of internal alkynes, trans-alkenes are always formed, either as initial products or via cis → trans isomerization [51], this being accompanied by alkane production through overhydrogenation [33]. Preliminary investigations suggested that the Pd-M samples were less active for the transformation of 4-octyne than for that of phenylacetylene.…”
Section: Resultsmentioning
confidence: 99%
“…565,566 Compound 179 containing zerovalent palladium was the first catalyst for stereoand chemoselective semihydrogenation of aromatic and aliphatic internal alkynes under TH conditions with formic acid/triethylamine. 188 A series of alkynes with a wide range of scope were employed in this catalytic system, and in most cases the desired Z alkenes were obtained with >99% conversions and >90% selectivities; meanwhile, both E alkenes and alkanes were found as side-products.…”
Section: Osmium-based Catalystsmentioning
confidence: 99%
“…[45,50,51,[84][85][86][87][88][89] Our group has previouslyr eported ac atalytic system that was proposed to proceed via an in situ generated molecular [Pd 0 (IMes)] speciesa st he active catalyst( IMes = 1,3-bis-mesityl-imidazol-2-ylidene) (Scheme 5). [46,[90][91][92] Sprengers et al reported that the in situ generated catalyst is significantly more active than the isolated catalyst. [93] One explanation for this higher activity is that less maleic anhydride (MA) ligand is appliedf or the in situ generated species.…”
Section: Pdmentioning
confidence: 99%